From 6660722bd74d97bab68d540939e2e444b7eb4c6a Mon Sep 17 00:00:00 2001
From: igneum-labs <337424239+igneum-labs@users.noreply.github.com>
Date: Tue, 6 Oct 2026 22:27:50 +0000
Subject: [PATCH] latency-ladder harness: genesis (header version 0) is out of
 the low-byte check; the first known-failed run tripped it (a harness fault,
 recorded in the file)

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
---
 infra/fast-time/latency-ladder.mjs | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/infra/fast-time/latency-ladder.mjs b/infra/fast-time/latency-ladder.mjs
index 0dbb1f0a..be95e437 100644
--- a/infra/fast-time/latency-ladder.mjs
+++ b/infra/fast-time/latency-ladder.mjs
@@ -178,7 +178,8 @@ const bitsOf = (v) => (v & 0x8000) ? 'up' : (v & 0x4000) ? 'down' : 'none';
 const ladderBits = blocks.reduce((m, b) => { const k = bitsOf(b.version); m[k] = (m[k] || 0) + 1; return m; }, {});
 const upShareOnChain = blocks.length ? Math.round(10000 * (blocks.filter(b => bitsOf(b.version) === 'up').length) / blocks.length) : 0;
 const objectBytes = blocks.reduce((m, b) => { const v = (b.version >> 8) & 0x3f; m[v] = (m[v] || 0) + 1; return m; }, {});
-const lowBytes = new Set(blocks.map(b => b.version & 0xff));
+// genesis carries header version 0 (genesis.rs), every mined block the block version 2 in its low byte
+const lowBytes = new Set(blocks.filter(b => b.daa > 0).map(b => b.version & 0xff));
 
 const programs = new Map();
 for (const i of [0, 1, 2]) for (const l of minerLog(i)) {
@@ -229,7 +230,8 @@ const common = {
   rung0_ids_equal_the_cli_rung0_id: idRows.filter(r => r.reps === RUNG0).length > 0 && idRows.filter(r => r.reps === RUNG0).every(r => r.cli_rung0 != null && r.cli_rung0 === r.miners_id),
 };
 // every block carries block version 2, an object byte of 0 (class signalling off) and the ladder bits of one of the three
-// nodes; genesis, made before any node, is the one bit-less block when every node signals
+// nodes; genesis, made before any node, is the one bit-less block when every node signals (the first run of the known-failed
+// case, 22:26Z, failed this check on genesis's version 0 in the low-byte test, a harness fault, not a chain one)
 const noneNodes = SIGNAL.filter(s => s === 'none').length;
 common.chain_carries_the_bits = blocks.length > 0 && [...lowBytes].every(v => v === 2) && Object.keys(objectBytes).every(v => +v === 0)
   && Object.keys(ladderBits).every(k => SIGNAL.includes(k) || k === 'none') && (noneNodes > 0 || (ladderBits.none || 0) === 1);